Trap for steam-heating systems.



G. H. KIRKHAIVI.

TRAP FOR STEAM HEATING SYSTEMS.

APPLlcATloN FILED DEc.2, 1914.

LQAAQ. Paten-ted. Jan. 22, 1918.

,m Illu] QQ E Ill. lll E IMIHIII L GEORGE H. KIRKHAM, OF NILES, MICHIGAN.

TRAP FOR STEAM-"HEATING SYSTEMS.

Speeication of Letters Patent.

Patented titan. 22, wlt.

Application filed December 2, 1914. Serial No. 875,091.

To (IZZ whom if may concern:

Be it known that I, GEORGE H. KIRKHAM, a citizen of the United States, residing at N'les, in the county of Berrien and State of Michigan, have invented certain new and useful Improvements in Traps for Steam- Heating Systems, of which the following is a specification.

The invention relates to a return trap designed particularly for use at the discharge outlets of radiators, steam coils, driers, and the like, with the customary return pipe, for the purpose of permitting air. and the water of condensation to flow into the return pipe while preventing the passage of the steam.

The improved return trap is made in the form of an ordinary bushing fitting capable of being readily and inexpensively constructed, and being readily tapped into a radiator section, the construction presenting a non-siplioning water seal.

The invention in the preferred form of details will be described in the following specification, reference being had particularly to the accompanying drawings, in which:

Figure 1 is a View in elevation of the improved trap.

Fig. 2 is a longitudinal central section of the same. y

Fig. 3 is a view in elevation partly in scction, showing a radiator and illustrating the application of the improved trap thereto.

The improved trap comprises a body l integrally constructed in complete formation. The external form of the body is cylindrical, having a downwardly and inwardly inclined inner end Q, so that at the lower end of the body, when the fitting is in place, a greater longitudinal length is presented, than at the upper end. The body is` formed with an interior chamber 3, corresponding in shape to the respective walls of the body, being cylindrical in cross section, of greatest length at the bottom of the body, and of gradually decreasing length toward the top. The chamber 3 is of such formation that the rear wall 2 of the body, which constitutes a hood, is of uniform thickness. The forward wall 4 of the body is also of uniform thickness, but of increased dimensions compared with the rear wall. The forward wall l is tapped at 5 to receive the return pipe 6, the disposition of the opening being nearer the bottom of the chamber f3, as clearly shown in Fic". 2. The bottom wall of the chamber 3 is formed with an elongated slot 7, the arrangement of which is immaterial except that the area of the opening formed by the slot must be at least equal the area of the open end of the outlet pipe 6. The rear wall 2 of the body is formed near the upper end with a vent opening 8.

The fitting is formed at its forward or outer end with an angular flange-extension 9, for convenience in applying and removing the fitting, the body being exteriorly threaded at l0 to be fitted into an interiorly threaded opening formed in the appropriate radiator section, as shown in Fig. 3, the return pipe being subsequently fitted, as will be ob- Vious.

ln use the improved return trap is completely water sealed, and obviously nonsiphoning, the air readily escaping through the water seal while the steam is held back.

T he particular form of the return trap is of decided advantage in that it may be cast integral, thereby permitting its inexpensive manufacture, may' be easily tapped into a radiator section, thereby being as readily applicable to radiators already installed and in use, as to new installations, and by reason of entire absence of movable parts cannot get out of order, nor require or permit adjustment, hence maintaining its efficiency and reliability.

What is claimed isz- A return trap for radiators including a chamber formed by a cylindrical wall and by end walls, one of the end walls being inclined with respect to the other to form an interior chamber having a gradually decreased area from bottom to top, and means for connecting the trap to the radiator to dispose the chamber wholly within the radiator, said chamber being formed in a, cylindrical wall at the portion of maximum area of said chamber measured on a vertical plane, an inlet opening, and one end wall being formed above said inlet opening with a return pipe opening.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE H. KIRKHllf. lVitnesses.

L. W. COOK, Geenen J. Ourson.

Copies of this patent may be obtained for ve cents each. by addressing the Commissioner et Entente,

Washington, D. G. 

